1) 222 g of water at 87°C & 326 g of glycerin at 33°C are poured into a 347 g co
ID: 2017080 • Letter: 1
Question
1) 222 g of water at 87°C & 326 g of glycerin at 33°C are poured into a 347 g copper cup at 2°C. Assuming these three make up a closed (or isolated) system, determine the final temperature of the system. The specific heat of water is 4186 J/kg·°C. The specific heat of glycerin is 2410 J/kg·°C. The specific heat of copper is 387 J/kg·°C.
2)A rock weighing 8384 N rock with a volume of 31 L is completely submerged in mercury. The density of mercury is 13.6 kg/L.
a.) Determine the density of the rock.
b.) Determine the buoyant force on the rock.
Explanation / Answer
The mass of the water mw = 0.222 kg
The mass of the glycerin mg = 0.326 kg
The mass of the copper cup mC = 0.347 kg
From calorimetry
mwcwT1 = mgcg T + mCc T
(0.222)(4186)(87 - T) = (0.326)(2410)(T - 33) + (0.347)(387)(T - 2)
80848.404 - 929.292T = 785.66T - 25926.78 + 134.289T - 268.578
(1849.241) T = 107043.762
T = 57.9 deg
** plz post each quetion separately
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